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PSoC™ 4 Forum Discussions

akoschak_param
Level 1
First reply posted First question asked Welcome!
Level 1

Hi all

We use the CY8C4244LQI-443 in a low power project. The part is set to hibernate mode triggered by an external signal. Everything works well, but we see that the time it takes from calling CySysPmHibernate() to the actual hibernate mode current consumption is roughly 260msec, which is too long for our application scenario. The current stays high at the same level for that time and then suddenly drops to aprox. 1-2uA.

Is there any documentation on that timing when entering lowpower modes? What does that latency for entering hibernate mode depend on? Is it dependent on a certain amount of clock cycles? External capacitors? Pin or peripheral configuration?

Kind regards

 

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Gautami_12
Moderator
Moderator 25 solutions authored 50 replies posted 10 likes received
Moderator

Hi @akoschak_param,

Please can you refer to the 3.3 section of  PSoC®4 Low-Power Modes and Power Reduction Techniques document.?Please let us know how did you calculate the time it takes from calling CySysPmHibernate() to the actual hibernate mode current consumption.

Warm Regards
Gautami J

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akoschak_param
Level 1
First reply posted First question asked Welcome!
Level 1

Hello Gautami

I am not able to find any timing information on entering hibernate mode in the documentation.

On our hardware there is a digital input which is used to enter hibernate mode. We have measured the signal and the current consumption. As soon as the signal is set to zero, hibernate mode is entered, but the current decreases only after 260msec. What is the time that normally the CPU takes to enter hibernate mode?

Kind regards,

Andreas

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